This document shows how to disable Internet Connection Sharing (ICS)
during the preparation to install or upgrade to the Cisco VPN Client 3.5.X for
Windows on Microsoft Windows XP. You need to disable ICS if you encounter the
must disable ICS error message while you attempt
to install or upgrade to VPN Client 3.5.X.

Note: In VPN Client 3.5(1)D and later, there is an added a parameter to
ignore the ICS check prior to install. Refer to Cisco bug ID
CSCdw75927
(registered customers only)
for more information.

The information in this document is based on these software and
hardware versions.

Cisco VPN Client 3.5.X for Windows

Microsoft Windows XP

The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.

If the previous steps do not work, then try to edit the registry.
It is possible that even though the Control Panel shows ICS as disabled, the
registry value could still show it as enabled. In that case you still need to
disable ICS through the registry even though you already disabled it through
the Control Panel.

Now review the DWORD value Start, where 0x2 = ICS
enabled and 0x3 = ICS disabled. If the value shows 0x2, then
right click and modify it to show 0x3. This manually forces
ICS to shut off and allows the VPN Client installation to continue.